Done in 0.5.6 (commit 4f1488ece5) ☺
Support for syncing multiple address books
Please add support for syncing multiple address books instead of chosing between them.
I have one address book for all users on the server and one personal. So chosing between those is not what I would like to do…
So in short: please make it possible to sync address books like the different calendars.